Final answer:
Sealing the top of a glass of water increases the pressure at the bottom due to the weight of the air above pushing down, explained by Pascal's principle.
Explanation:
When the top of a glass of water is sealed, the pressure at the bottom of the glass increases due to the additional weight of the air above the water pushing down on it.
This increase in pressure occurs because the sealed top prevents the air from equalizing the pressure, causing the water at the bottom to experience a higher pressure than when the top is open.
This phenomenon is explained by Pascal's principle, which states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid.
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